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astrophysics.uchicago.edu screenshot

Report Summary

  • 42

    Performance

    Renders faster than
    61% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 88% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 90

    SEO

    Google-friendlier than
    68% of websites

astrophysics.uchicago.edu

Department of Astronomy and Astrophysics | The University of Chicago

Page Load Speed

848 ms in total

First Response

45 ms

Resources Loaded

515 ms

Page Rendered

288 ms

astrophysics.uchicago.edu screenshot

About Website

Welcome to astrophysics.uchicago.edu homepage info - get ready to check Astrophysics U Chicago best content for United States right away, or after learning these important things about astrophysics.uchicago.edu

The Department of Astronomy & Astrophysics is a world leader in astrophysical research and offers rigorous academic programs at both the graduate and undergraduate level.

Visit astrophysics.uchicago.edu

Key Findings

We analyzed Astrophysics.uchicago.edu page load time and found that the first response time was 45 ms and then it took 803 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

astrophysics.uchicago.edu performance score

42

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.1 s

48/100

10%

LCP (Largest Contentful Paint)

Value6.7 s

8/100

25%

SI (Speed Index)

Value3.5 s

88/100

10%

TBT (Total Blocking Time)

Value370 ms

71/100

30%

CLS (Cumulative Layout Shift)

Value0.812

4/100

15%

TTI (Time to Interactive)

Value7.4 s

48/100

10%

Network Requests Diagram

astrophysics.uchicago.edu

45 ms

astrophysics.uchicago.edu

23 ms

js

293 ms

fonts.css

84 ms

site.css

19 ms

Our browser made a total of 40 requests to load all elements on the main page. We found that 10% of them (4 requests) were addressed to the original Astrophysics.uchicago.edu, 53% (21 requests) were made to D3qi0qp55mx5f5.cloudfront.net and 13% (5 requests) were made to . The less responsive or slowest element that took the longest time to load (293 ms) relates to the external source Googletagmanager.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 124.8 kB (5%)

Content Size

2.8 MB

After Optimization

2.6 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Astrophysics.uchicago.edu main page is 2.8 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 60% of websites need less resources to load. Images take 2.3 MB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 23.8 kB

  • Original 29.7 kB
  • After minification 23.3 kB
  • After compression 5.9 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. This page needs HTML code to be minified as it can gain 6.3 kB, which is 21% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 23.8 kB or 80% of the original size.

Image Optimization

-2%

Potential reduce by 56.9 kB

  • Original 2.3 MB
  • After minification 2.3 MB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Astrophysics U Chicago images are well optimized though.

JavaScript Optimization

-23%

Potential reduce by 43.1 kB

  • Original 186.7 kB
  • After minification 186.7 kB
  • After compression 143.6 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 43.1 kB or 23% of the original size.

CSS Optimization

-0%

Potential reduce by 951 B

  • Original 227.4 kB
  • After minification 227.4 kB
  • After compression 226.4 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Astrophysics.uchicago.edu has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 9 (30%)

Requests Now

30

After Optimization

21

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 30 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Astrophysics U Chicago. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

astrophysics.uchicago.edu

astrophysics.uchicago.edu

45 ms

astrophysics.uchicago.edu

astrophysics.uchicago.edu

23 ms

js

js

293 ms

fonts.css

fonts.css

84 ms

site.css

site.css

19 ms

modernizr.min.js

modernizr.min.js

54 ms

jquery.min.js

jquery.min.js

54 ms

jquery-ui.min.js

jquery-ui.min.js

60 ms

8070e183dd.js

8070e183dd.js

86 ms

core-min.js

core-min.js

48 ms

B561D5E22E5799889.css

B561D5E22E5799889.css

4 ms

fbevents.js

fbevents.js

229 ms

shield.svg

shield.svg

100 ms

astro.svg

astro.svg

102 ms

astro-grads-20231430.jpg

astro-grads-20231430.jpg

133 ms

front-2020-08-06-simulation.jpg

front-2020-08-06-simulation.jpg

134 ms

2021-03-29-mt.jpg

2021-03-29-mt.jpg

135 ms

front-yerkes.jpg

front-yerkes.jpg

133 ms

front-maroon-x.jpg

front-maroon-x.jpg

135 ms

people-2022.jpg

people-2022.jpg

137 ms

transparent.gif

transparent.gif

141 ms

uchicago_wordmark_maroon-transparent.svg

uchicago_wordmark_maroon-transparent.svg

139 ms

1+jvzChiN

1+jvzChiN

40 ms

MKGI0=

MKGI0=

40 ms

HpAawDtjwP9fo78woYjQ==

HpAawDtjwP9fo78woYjQ==

40 ms

HpAawDtjwP9fo78woYjQ==

HpAawDtjwP9fo78woYjQ==

40 ms

1+jvzChiN

1+jvzChiN

38 ms

ss-symbolicons-block.woff

ss-symbolicons-block.woff

135 ms

ss-social-regular.woff

ss-social-regular.woff

132 ms

prev.png

prev.png

100 ms

next.png

next.png

113 ms

loading.gif

loading.gif

116 ms

close.png

close.png

113 ms

2024-02-29-news.jpg

2024-02-29-news.jpg

90 ms

YorkDon-270.jpg

YorkDon-270.jpg

89 ms

2024-02-09-olinto270.jpg

2024-02-09-olinto270.jpg

87 ms

analytics.js

analytics.js

61 ms

js

js

81 ms

js

js

106 ms

collect

collect

19 ms

Accessibility Review

astrophysics.uchicago.edu accessibility score

96

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Links do not have a discernible name

Best Practices

astrophysics.uchicago.edu best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

astrophysics.uchicago.edu SEO score

90

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Astrophysics.uchicago.edu can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Astrophysics.uchicago.edu main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

astrophysics.uchicago.edu

Open Graph description is not detected on the main page of Astrophysics U Chicago. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: